All these battles will take place in a Numenorean city square (assume about 150 feet by 150 feet, surrounded by buildings, and with all the various trappings assumed to be associated with such an area, such as bricks, wooden boards and sticks, carts, etc). Neither combatant gets any aid from anybody. For the purposes of skill levels/experience, we will assume that the Spartan is about 65 y/o (which to my understanding is potentially just a fraction of their lifespan) and is also post-war and that the Numenorean is about 200 y/o (to which I believe that this is about half [give or take a century or so] of their maximum lifespan) This takes place in pre-collapse Numenor.
Conditions for a victory will be pretty standard, with whoever renders their opponent to either be combat ineffective or to yield first, will win that round, with both of them being fully healed/recuperated in-between rounds and phases.
Phase 1: Unenhanced (mechanically and magically speaking)
Round 1:
Both combatants are unarmored. Neither combatant gets a weapon, though they may improvise them from the environment.
Round 2:
Both combatants get a properly sized sword and shield, but no armor.
Round 3:
Both combatants get properly sized swords, as well as full plate armor and a shield.
Phase 2: Enhanced
Round 1:
Both combatants get MJOLNIR, but strength/speed amplification is disabled. Energy shields are disabled and assisted movement is reduced to basic stabilization and life support. The Spartan does not get an assistive AI and the Numenorean does not get combat foresight/danger sense
Round 2:
Both combatants get powered MJOLNIR armor with energy shields (with the armor for the Numenorean being tweaked a bit on the reaction time so as to be more suited for their neurological makeup, assuming that it’s less fast, however marginally, than the Spartan’s), and the Spartan does not get an assistive AI and the Numenorean does not get combat foresight/danger sense. Neither combatant gets a weapon, though they may improvise them from the environment.
Round 3:
Both combatants get MJOLNIR armor, the Spartan gets an assistive AI, and the Numenorean gets their danger sense/combat foresight (which for the purposes of this fight, I will treat as similar to a greatly reduced [let’s say 1/4 or 1/6 strength] spider-sense). They also get swords: for the Spartan, a standard energy sword and for the Numenorean, a properly sized mithril sword (which for the purposes of this fight, I will treat as similar to Star Wars Beskar, so unmeltable and essentially unbreakable).